<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <div>
    <!-- 点击label就可以聚焦于对应的input 当然如果input是radio类型，那也一样的 -->
    <!-- name就是表单提交的时候，放到请求中的param键值 -->
    <label for="username">
      性别: 
      <input id="username" type="text" name="username">
    </label>
    
  </div>
  <div>
    <label for="password">
      密码: 
      <input id="password" type="password" name="password">
    </label>
  </div>

</body>
</html>